• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.19 no.2
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• pp.81-87
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• 2009

Final purpose of this study was designed to develop the quality control(QC) sample for proficiency analytical testing of asbestos. This study consisted of two parts; first, development of manufacturing apparatus and sample preparing procedure for asbestos quality control(QC) sample: second, validation of the QC samples made by our developed method as asbestos proficiency analytical testing sample. The main results of the first part research are as followed We developed the apparatus for manufacturing the asbestos QC sample, consisted of filter hold, filter holder manifolder, vacuum system, and vacuum pump. The most proper filter of making the QC samples was a cellulose ester membrane filter with 25 mm diameter, pore size 0.8 um. And we presented the optimal procedure for preparing the asbestos QC sample by using the developed apparatus. We will verify the manufactured asbestos QC samples by this method, and present the validation results to confirm the reliability as a asbestos QC sample in next paper.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.99-100
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• 2022

As the danger of exposure to the asbestos has been revealed, the importance of demolition asbestos in existing buildings has been raised. Extensive body of study has been conducted to evaluate the risk of demolition asbestos, but there were confined types of variables caused by not reflecting categorical information and limitations in collecting quantitative information. Thus, this study aims to derive a model that predicts the risk in workplace of demolition asbestos by collecting categorical and continuous variables. For this purpose, categorical and continuous variables were collected from asbestos demolition reports, and the risk assessment score was set as the dependent variable. In this study, the influence of each variable was identified using logistic regression, and the risk prediction model methodologies were compared through decision tree regression and artificial neural network. As a result, a conditional risk prediction model was derived to evaluate the risk of demolition asbestos, and this model is expected to be used to ensure the safety of asbestos demolition workers.

• Journal of the Korean Society of Visualization
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• v.13 no.3
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• pp.15-19
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• 2015

We developed a high-throughput microscopy (HTM) method which enabled us to replace a conventional phase contrast microscopy (PCM) method that has been used as a standard analytical method for airborne asbestos. We could obtain the concentration of airborne asbestos fibers under detection limit by automated image processing and analysis using HTM method. Here we propose an improved image processing algorithm with variable parameters to enhance the accuracy of the HTM analysis. Since the variable parameters that compensate the difference of the brightness are applied to the individual images in our new image processing method, it is possible to enhance the accuracy of the automatic image analysis method for sample slides with low asbestos concentration that caused errors in binary image processing. We demonstrated that enumeration of fibers by improved image processing algorithm remarkably enhanced the accuracy of HTM analysis in comparison with PCM. The improved HTM method can be a potential alternative to conventional PCM.

• Journal of the Mineralogical Society of Korea
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• v.26 no.2
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• pp.87-99
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• 2013

The occurrence, mineralogical characteristics, and origin of the dolomite ores were investigated from major dolomite mines in South Korea. Mineralogical and textural properties of the ores and associated minerals were analyzed using X-ray diffraction, thin section petrography, and scanning electron microscopy. Dolomite ores were light to dark gray in color and mainly composed of dolomite in varying particle size with minor amounts of calcite, quartz and micas. Calcite, quartz, illite, feldspar, kaolin minerals, and chlorite occurred in local veins, dikes and alteration zones. Sepiolite and wollastonite occurred in the altered part of some mine. Asbestos minerals such as chrysotile and tremolite, however, were not identified in the present study. Reddish brown to yellow clay materials were mainly composed of illite, occasionally associated with kaolin minerals and smectite. These clay minerals might be a product of the local hydrothermal alteration related to the dyke intrusion and subsequent weathering. As well indicated in the previous studies, mineral composition, texture, and occurrence of the dolostone beds suggest their formation through the diagenesis of carbonate sediments deposited in the shallow sea during the Precambrian to Paleozoic period.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.353-356
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• 2012

본 연구에서는 주택화재가 발생할 경우, 실내 바닥재로부터 발생하는 연소생성가스들 가운데 $CO_2$ 및 non-$CO_2$ 가스의 배출량을 정량적으로 분석하고자 하였다. 실험 방법으로는 주택에서 널리 쓰이는 타일카페트, 러버타일, PVC비닐석면, 데코타일, 모노륨 등 5가지 종류의 실내 바닥재를 대상으로 콘칼로리미터와 NDIR을 이용하여 연소에 따른 $CO_2$ 및 non-$CO_2$ 가스들에 대한 배출량에 대한 분석을 수행하였다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.223-224
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• 2003

포장도로에서 발생되는 미세먼지는 주로 자동차의 운행에 의한 직접 배출되는 입자와 도로 표면에서 비산되는 토양입자 그리고 타이어나 브레이크 패드의 마모에 의한 고무 및 석면 둥 다양한 배출원에 의해 발생되는데, 도로 주변의 배출원에 의해 많은 영향을 받을 것으로 판단된다. (최금찬등, 1996) 특히 인천에는 많은 비산먼지 배출원이 산재하여 있어, 이 들 배출원들의 영향이 여타 대도시보다 클 것으로 판단된다. 따라서, 본 연구에서는 인구와 교통량이 많고 공업활동이 활발한 인천지역의 주요 포장도로(H-ADT: High Average Daily Traffic, 5,000대/일 이상인 도로)에서 채취한 silt를 주거지역, 공업지역, 상업지역, 기타지역별로 채취하여 화학적 성분분석을 통해 지역별 특성을 조사하여, 각 지역 별 포장도로에서의 silt의 기원이 무엇인지를 추정하는 기초자료를 구축하고자하였다. (중략)

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.23 no.3
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• pp.205-211
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• 2013

Objectives: 21 sepiolite substances produced in China were investigated for the presence of asbestos in their materials. Materials and methods: In order to identify asbestos in sepiolite substances, test materials were analyzed using a transmission electron microscope equipped with energy dispersive X-ray spectrometer (TEM-EDS) for confirming their shape and components (atomic %). Results: Five of 21 sepiolte substances were asbestos-containing materials. Two chrysotile containing sepiolite proved to be asbestoscontaining materials, as did two chrysotile mixed with tremolite containing sepiolite. 16 sepiolite substances did not contain asbestos materials. Conclusions: When importing sepiolite substances, they must be analyzed to determine if there is asbestos in their materials.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.174-175
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• 2014

A Rural house in Chungcheong area have been variety of matters, rapid deterioration of house and incomplete of maintenance control, that is represented lack of durability heating from lack of heat insulation property, health worsening form use of toxic substance and so on. For farmers who did not know where to repair and how to repair, they are urgently needed measures of standard and basis that is to realize a condition of rural house. Accordingly, this study drew major matters and priority for revitalization through analysis of type of rural house from research on the actual condition in order to develope of diagnostic criteria of rural house.

• 월간산업보건
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• s.88
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• pp.57-60
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• 1995

PAT program(The Proficiency Analytical Testing Program)은 미국산업위생협회(American Industrial Hygiene Association AIHA)와 미국산업안전보건연구원(National Institute for Occupational Safety and Health NIOSH)에서 공동주관하는 정도관리로서 일년에 4회 실시하고 있다. 실시항목은 금속(납, 카드뮴, 크롬, 아연), 유리규산, 석면, 유기,용제(Benzen, O-Xylene, Toluene, Carbon Tetrachloride, 1, 1, 1-Trichloroethane, Chloroform, Tetrachloroethylene, 1, 2-Dichloroethane, methanol, p-Dioxane)이다. 대한산업보건협회 산업보건연구소에서는 위의 4가지 항목을 모두 신청하여 1995년 1월에 실시된 120회 부터 참여하였는데 다음은 본 연구소의 120화에 대한 분석방법과 NIOSH로 부터 받은 결과이다.

• The Journal of Engineering Geology
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• v.8 no.1
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• pp.87-98
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• 1998

Multiple logging techniques consisting of geophysical logs, care logs, physical property measurements on core samples have been adopted on a test borehole drilled in the Pungam basin ; a small Cretaceous sedimentary basin located in Sosok area, Hongchon-gun, Kangwon Province, Korea. This study has been made to solve the problem of mismatches between the results of geophysical log and core log analyses. And the cause and range of depth errors as well as logging responses were studied. The result shows that the depth error caused by geophysical log is so small that it can be used as a reliable depth criterion in the borehole. The analysis of physical property measurements is also shown as very effective in determining the real depth and the geology of the borehole.